Computer Network

Hi viewers today I am going to share some information about data/computer network which is widely used all over the world. Before going to the topic of Computer network it is necessary to know some basic knowledge about a communication network and its components.

The first thing which every one should know is “What is a Network?” and what is it made up of, A network can be defined as the group of nodes interconnected, through which the entity flows.

The network consists of several components which can be named as: Node & Branch.

Network

 First of all Node is the basic component of a communication network and can be defined as a point where two or more branches meet. The general communication network may have infinite number of nodes but it’s not necessary that each one of them is to be interconnected to every node.

In the case of Data communication the ‘Packet switch’ acts as node. Next coming to the next component Branch, Branch can be defined as the transmission medium through which the data or entity flows.

The branch may be of wired or wireless medium..

Computer network:-

Computer network is a group of computers which are interconnected together using links or branches.

Computer network

The computer/Data network including the Internet carries digital data from source to destination. The switches used in the network are packet switches which use “Store & Forward” mechanism. The switches present in the network receive the data in the form of packets and stores them in the memory and then transmits them to the appropriate link which is free from congestion problem and is in working condition according to the address of the packet. The packet switches can also be called as routers.

Internet is a network of networks which was used to carry text messages, but now a days the advancement in technology has made possible to support the multimedia and even web facility also.

A computer network:-

·  Is primarily a digital network

·  Supports variable bit rates/bandwidth as data is bursty in nature.

·  Was originally designed carry non-real time traffic.

·  Is generally non-interactive.

·  Is full duplex.

·  Has to have switches with buffers.

According to ARPA the switches earlier were called as IMP (Interface Message Processors). Now they are called as PSE (Packet Switching Exchanges). While with respect to internet they are termed as routers.

                         

Necessity of the computer network:-

1. Resource sharing
2. High reliability.
3. Saving money and time.
4. It provides a powerful communication medium which enhances human-to-human communication.

Advantages:-

1. Reduces cost through sharing of data between users.
2. It allows sharing of resources.
3. It provides standardization of applications.
4. It enables efficient communication and scheduling.
5. Facilitates electronic access to remote computers.

Disadvantages:-

1. The fault in server penetrates in the user’s computer, which disturbs the running of users computer.
2. Fault on networks can cause loss of user’s data.
3. Internet makes it possible to find information quickly, but a lot of it can be misleading.
4. Electronic junk mail (spam) can be annoying.
5. E-mails containing active content can contain viruses.
6. Identity theft is a serious problem.

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